Multiple miter-clamp



H. V. HOLMAN.

MULTIPLE MITER CLAMP. APPLICATION FILED MAR. 14. 1919.

1,359,597. Patented Nov. 23, 1920.

/5 Z6 I p79 17 I a? lg Z E l 1' E i I l i l i /z 1 1 I l I I 1' l I I lJ 4- 1 1 I v 1 i I I r l I 1 I 1 l /j HARRY V. HOLMAN, OF CHICAGO,ILLINOIS.

MULTIPLE MITER-GLAMP.

Specification of Letters Patent.

Patented Nov. 23, 1920.

Application filed March 14, 1919. Serial No. 282,546.

'1 o all to from it may concern Be it lrrown that I, HARRY V. HQLMAN, acitizen. of the United States of America, and resident of Chicago, Cookcounty, lilinois, have invented a certain new and useful Improvement inMultiple Miter-Clamps, of which the following is a specification.

My invention relates to an improvement in multiple miter clamps-that is,to a clamp which is particularly adapted for clamping a frame at aplurality of points to hold the same in position after the glue has beenapplied until it is sufficiently set to permit the frame to be handledin the usual manner.

The object of my invention is to provide a multiple clamp which can bequickly adjusted to the frame, and which is adapted for very accurateadjustment, such as is necessary in connection with fine cabinet work.

These and other features and objects of my invention will be morereadily understood. by having reference to the accompanying drawings, inwhich I have illustrated one embodiment of my invention.

Figure 1 is a plan view of a multiple miter clamp, embodying myinvention.

Fig. 2 is a sectional view taken on the line 22 of Fig. 1, looking inthe direction of the arrows.

Fig. 3 is an enlarged detail of a form of my invention.

1 have illustrated a clamping device consisting of a clampin framecomposed of a base member 10, side members 11 and 12, and an end member13. This clamping frame is adapted to be placed about a piece of work M-which it is desired to hold in place while the glue is setting. The fourcorners of the clampingframe are adjustably connected together byclamping devices, each of which consist of a threaded spindle 15whichpasses freely through openings in the adjacent end of the clampingframe members. The ends of each of these clamping frame members arebored laterally to receive a metallic pin 16. The threaded spindles 15pass through transverse openings in these pins 16, and have threadedengagement therewith. Each of the spindles 15 is divided into twosections, one section being provided with a left-hand thread, and theother section with a right-hand threat, which sections engage with thecorresponding metallic pins of adjacent clamping frame members, so thatoperation of these modified clamps operate to draw the adjacent memheretogether. These pins are capable of pivotal movement in their bearingsockets, and thus permit relative angular movement of adjacent framemembers. In order to increase the extent of this angular movement of theclamping members, the openings through the members 10 and 11 and 10 and12 are cut away or flared, as indicated in dotted lines in Fig. 1.Passing through the pins 16, associated with the upper end of theclamping members 11 and 12, there is a set screw 17 for the purpose oflocking the corresponding spindles 15 in adjusted position. The cornersbetween the members 10 and 11 and 10 and 12 likewise are cut away, as incheated at 18, to permit themembers 11 and 12 to pivot about the member10, to thereby assist in the assembling of the clamping device.

When it is desired to apply my clamping device, the members 10 and 11and 10 and 12 are connected together by means of the correspondingthreaded spindles, and the member 13 applied to the opposite ends of themembers 11 and 12, but loosely connected thereto, as indicated in dottedlines in Fig. 1. The spindles 15, associated with the lower clampingmembers, are then suitably adjusted to draw the members 11 and 13 and 12and 18 together, the right and left hand threads of the spindleoperating to accelerate this movement. Likewise, it. will be noticedthat the handles 19, for operating these spindles, are relatively closetogether,

so that they can be easily operated simub taneously for adjusting theclamp. After these lower clamping members have thus been moved intoposition, the upper clamping members can be slightly adjusted, ifnecessary, to bring about a more accurate adjustment between the members10 and 11 and 10 and 12. l Vhen proper adjustment has been made, the setscrews 17 can then be sightened to lock the clamp in position. In. orderto prevent the glue, which is apt to be squeezed from the corners of thework,

sticking to the clamping frame members, the

corners of these members should be cut out to form a channel 20.

it will thus been seen that I have devised a very eflicient form ofmultiple clamp which is adapted to simultaneously hold the four cornersof the work, and which can be quickly and accurately justed. When it isdesired to release the two lower spindles by operating the handles 19which moves the side clamping members 11 and 12 outwardly, indicated indotted lines in Fig. 1, to thereby permit the clampmg device to bereadily removed rrom the work.

In Fig. 3, I have shown a slightly modified form of my invention inwhich instead of having the threaded spindles pass directly through theclamping members, I provide castings 21, :22, secured to adjacentcorners of the clamping members, which castings are provided withsuitable ears which are provided with longitudinal bores for the passageof the threaded spindles, and, likewise torm bearings for the metallicpins l6 with which the threaded spindles 15 have threaded engagement.The advantage of this construction is that these clamping devices can bereadily applied to clamping frames of varying sizes.

lVhile I have illustrated and described certain particular embodimentsof my invention, it will be understood that I do not wish to be limitedto the exact construction shown and described, but that various changesand modifications will readily suggest themselves to those skilled inthe art Without departing from my invention.

What I claim as my invention is: r

1; A multiple clamp comprising a rectangular frame having side and endmembers, means for connecting one of said end memhers to one end of saidside members, and adjustable means for connecting the other end memberto the opposite end of said id members, said adjustable means consistingoi? a metallic pin journaled adjacent the abutting ends of each of saidside and end members, and a threaded spindle passing transverselythrough said pins and having threaded engagement therewith.

2. A multiple clamp consisting of rectangular clamping frame having sideand end members, adjustable clamping devices for connecting togetheradjacent ends of said side and end members, said clamping devicesconsisting of a metallic pin journaled adjacent the abutting ends ofeach of said side and end members, and a threaded spindle passing freelythrough the abutted ends of said frame members and having threadedengagement with the corresponding metallic pins to thereby permitrelative adjustment or said frame members with re spect to each other.

3. A multiple clamp consisting of a rectangular clamping frame havingside and end members, adjustable clamping devices for connectingtogether adjacent ends of said side and end members, said clampingdevices consisting of a metallic pin journaled adjacent the abuttingends of said side and end members, and a threaded spindie passing freelythrough the abutting ends oi said frame members and having threadedengagcmei'it with the corresponding metallic pins to thereby permitrelative adjustment oi said thror 11 certain of said frame members beingflared or enlarged to thereby permit increased relative angular movementof said frame members with respect to each other. 4L. In a multipleclamp, an. end frame member, a pair of side frame members mountedadjacent the ends of said end member, means for connecting one end ofeach or". said side members to said end member, the outer portion ofeach of said abutting ends being cut away to permit said side members topivot about the end member, and adjustable means for connecting theopposite ends of said side members.

5. In a clamp, a clamping frame consisting of abutting end and sidemembers, means for connecting one end of each of said side members tothe adjacent end member, the outer portion of each of said abutting endsbeing cut away to thereby permit said members to pivot about said endmember, and a pair of threaded spindles j through the opposite ends ofsaid hers and adjacent ends of the other s ,1, end member, said rodshaving oppositely di aosed threads engaging the side and end members,whereby rotation of said rods causes said second end member to be movedtoward or away from said side members.

6. In a clamp, a clamping frame comprising end and sidemembers havingabutting ends, metallic pins journaled adjacent the ends of each of saidside members, a thread ed spindle passing transversely through the pinsin adjacent end and side members for adjustably connecting said end andside members, the outside corners of one end of said frame being cutaway whereby the operation of the threaded spindles, associated with theother end of said frame, operates to swing said side members about firstend member without effecting the aejustment between said members.

Signed by me at Chicago, Illinois, this 1st day of March, 1919.

HARRY V. HOLMAN.

frame members, the openings

